001/*
002 * This file is part of the JDrupes non-blocking HTTP Codec
003 * Copyright (C) 2016, 2017  Michael N. Lipp
004 *
005 * This program is free software; you can redistribute it and/or modify it 
006 * under the terms of the GNU Lesser General Public License as published
007 * by the Free Software Foundation; either version 3 of the License, or 
008 * (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful, but 
011 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
012 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
013 * License for more details.
014 *
015 * You should have received a copy of the GNU Lesser General Public License along 
016 * with this program; if not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jdrupes.httpcodec;
020
021import java.util.Optional;
022
023/**
024 * Represents an engine with an associated encoder and decoder.
025 */
026public abstract class Engine {
027
028        private String switchedTo = null;
029
030        /**
031         * Returns the protocol that this engine has been switched to, if any.
032         *
033         * @return the protocol
034         */
035        public Optional<String> switchedTo() {
036                return Optional.ofNullable(switchedTo);
037        }
038        
039        /**
040         * Noted that the engine has been switched to a new protocol.
041         *
042         * @param protocol the new protocol
043         */
044        protected void setSwitchedTo(String protocol) {
045                switchedTo = protocol;
046        }
047}